Lutein and zeaxanthin help shield the eye’s retina from damage by supporting healthy macular pigment density. Source Naturals Zea-Tein 20/20™ provides lutein and zeaxanthin, sourced from the marigold flower. These important carotenoid pigments aggregate in the retina and provide protection from the damaging effects of free radicals and ultraviolet light. Clinical studies suggest that this lutein-zeaxanthin dosage can support healthy macular pigment density, visual processing speed, and reaction time. Preliminary evidence also indicates that lutein supplementation may help support healthy cognitive performance.*